from itertools import batched

print(1+2-3)
print(1+2*3)#这里是先乘除后加减
print(1+2/3)

print((67.5+89.0+12.9+32.2)/4)

avg=(67.5+89.0+12.9+32.2)/4
total = (67.5-avg)**2+(89.0-avg)**2+(12.9-avg)**2+(32.2-avg)**2
result=total/3
print(result)



print(4**3)

a=10
b=a
print(b)

a=23
print(a)

x=9.9
print(type(x))

y="hello world"
print(y)
print(type(y))

e=' my name is "libai" '#这个字符串长度是20，空格也算一个字符
print(e)

f=''' my 'name' is "libai" '''
print(f)

u=""" my 'name' is "zhangfei" """#这里注意除了红色代表出错，黄色代表警告，其他都不算错。
                                # 这里的绿色横线，就是因为这个字符串不是常见的单词
print(u)
print(len(y))
print(len(e))


a1="class"
a2="room"
print(a1+a2)#这个叫字符串拼接


k1="True"
k2=True
k3=False
print(type(k1))
print(type(k2))
print(type(k3))




















